Saved Bookmarks
| 1. |
solve the pair of equations 2 by X + 3 by y equals to 11 and 5 by x minus 4 Y = 2 - 7 hence find the value of 5 x minus 3 y |
| Answer» GIVEN EQUATIONS are 2x+3y=11−−−−(1)2x−4y=−24−−−−(2)FORM (1)2x+3y=11 ⇒2x=11−3y⇒x=211−3y−−−(3)substituting x in(2)2x−4y=−24 ⇒2(211−3y)−4y=−24⇒11−3y−4y=−24⇒11−7y=−24⇒7y=35⇒y=35/7⇒y=5.putting y = 5 in (3) x=211−3(5)⇒x=211−15⇒x=−4/2∴x=−2.Hence x = -2 and y = 5 is the solution of the equation.Now, we have to FIND my=mx+3 ∴m=−15=3(−2)+35−3=−2m⇒−2m=2⇒m=− | |