2x - 5 = 15
2x = 20
x = 10
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8x = 2x + 15 6x = 15 x = 15/6 = 2.5
48
8 , and 7. x+y=15 >> x=-y+15 x*y=56 >> y*(-y+15)=56 , then solve for y , put y back into either equation for x.
I assume that the question means 4x-7=2x+5. In that case, the answer x would equal 6.
You cannot solve it with two unknown values 'x' & 'y' . However, it can be rearranged to form a strasight line eq'n. Hence -3x -3y = -15 Cancel down by '3' Hence -x -y = -5 Multiply by '-1', Hence x + y = 5 Hence y = -x + 5 Is the straight line eq'n. It has a slope/gradient of '-1' ; the coefficient of 'x' It intercepts the y-axis at '5'. ; ( 0,5)