A few days ago
solve for the system of eqns y=4x+20 and y=7x show steps?
solve for the system of eqns y=4x+20 and y=7x show steps?
Top 3 Answers
A few days ago
Favorite Answer
y=7x
x=y/7
plug into other equation
y = 4(y/7) + 20
y = 4y/7 + 20
-20 = 4y/7 – y
-20 = 4y/7 – 7y/7
-20 = -3y/7
-140 = -3y
y = 140/3
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A few days ago
y=4x+20 and y=7x
7x = 4x +20
3x = 20
x = 20/3
y = 7(20/3)
y = 140/3
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A few days ago
7x=4x+20
+-4x=+-4x add -4x to both sides
3x=20 the 4x on top and the -4x on the bottom cancel out
3/3x = 20/3 divide both side by 3
x=6 2/3
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